From outburst to quiescence: spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula. Issue 2 (8th April 2019)

• Record Type: Journal Article
• Authors: Hernández Santisteban, J V; Echevarría, J; Zharikov, S; Neustroev, V; Tovmassian, G; Chavushyan, V; Napiwotzki, R; Costero, R; Michel, R; Sánchez, L J; Ruelas-Mayorga, A; Olguín, L; García-Díaz, Ma T; González-Buitrago, D; de Miguel, E; de la Fuente, E; de Anda, R; Suleimanov, V
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 486:Issue 2(2019)
• Page Start: 2631
• Page End: 2642
• Publication Date: 2019-04-08
• Subjects: cataclysmic variables -- stars: dwarf novae -- white dwarf -- stars: individual: V1838 Aql -- ISM: bubbles; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz798
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: We analyse new optical spectroscopic, direct-image and X-ray observations of the recently discovered a high-proper motion cataclysmic variable V1838 Aql. The data were obtained during its 2013 superoutburst and its subsequent quiescent state. An extended emission around the source was observed up to 30 d after the peak of the superoutburst, interpreted it as a bow shock formed by a quasi-continuous outflow from the source in quiescence. The head of the bow shock is coincident with the high-proper motion vector of the source ( v ⊥ = 123 ± 5 km s −1 ) at a distance of d = 202 ± 7 pc. The object was detected as a weak X-ray source (0.015 ± 0.002 counts s −1 ) in the plateau of the superoutburst and its flux lowered by two times in quiescence (0.007 ± 0.002 counts s −1 ). Spectroscopic observations in quiescence we confirmed the orbital period value P orb = 0.0545 ± 0.0026 d, consistent with early-superhump estimates, and the following orbital parameters: γ = −21 ± 3 km s −1 and K 1 = 53 ± 3 km s −1 . The white dwarf is revealed as the system approaches quiescence, which enables us to infer the effective temperature of the primary Teff = 11 600 ± 400 K. The donor temperature is estimated ≲2200 K and suggestive of a system approaching the period minimum. Doppler maps in quiescence show the presence of the hotspot in He i line at the expected accretion disc-stream shock position and an unusual structure of the accretion disc in Hα.